Log-carriage offset for saws.



Patented Sept. 30; l|902.

s. :nm LUG CARRIAGE OFFSET. FOR SAWS.-

(Appumion nud Jan'. 1s, 1902,)

2 Sheets-Silent I.

kuunndel.)

l/d'la a I I I l I I l l .|,II Il IIIIIU /N VEA/ron ,Samuel Erb.

W/ TNE SSE S PatentedV Sept. 30,1902; s.-En. LUG ll'QAVRIIAI'E OFFSET FDR SAWS.'

(Application lad Jan. 13, 1902.)

2 Sheets-*sheet 2.

(lio Model.)

EEIIQ WTNESSES Y /N VENTO/L? Samuel Erb.

OHNEY mi mums varias ca.. P HoQLn-mo., WASHINGTON, D c,

NlTED STATES PATENT OFFICE.

SAMUEL ERB, OF OI-IEMAINUS, CANADA, ASSIGNOR OF ONE-HALF TO THE WILLIAM HAMILTON MANUFACTURING CO., LTD, OF PETERBOROUGH,

ONTARIO, CANADA.

LOG-CARRIAGE OFFSET FOR SAWS.

SPECIFICATION forming part of Letters Patent No.' 709,890, dated September 30, 1902.

Application filed January 1s, 1902. serial No. 89,562. (No model.)

To all whom t mfc/y concer-71,:

Be it known that I, SAMUEL ERB, a citizen of the United States, residing at Ohemaiuus, Vancouver Island, British Columbia, Dominion of Canada, have invented certain new and useful Improvements in Log-Carriage Oisets for Saws; and I do hereby declare that the following is a full, clear, and exact description of the invention, such as will enio able others skilled in the art to which it appertains to make and use the same.

My invention relates to an improved logcarriage offset fora saw, the advantage of which is well understood in the industry and x5 the necessity for a simpleand efficient device generally admitted.

In the invention herein described the first movementI of the reversed direction of travel of the log-carriage is utilized to ltraverse the zo body of the carriage laterally on the axles of its Wheels from and to the saw at the beginning and end of its movement, and the mechanism is simple, direct, and not liable to derangemeut.

z5 The device is fully illustrated in the accompanying drawings, inv which- Figure lis a cross-section ofthe underframc of a log-carriage having my gear attached looking in the direction of the arrow Ain 3o Fig. 2. Fig. 2 is a plan of that portion of the oilsetting-geauwhich is attached to the carriage-frame. Fig. 3 is a smallscale longitudinal sectional elevation of the car and its track, showing the means by which I actuate 55 the offset-gear; and Fig. 4 is a plan of the same.

Throughout the severall views the arrow I) indicates the direction of motion of the carriage, and P the pull of the line which actu- 4o ates the offset-gear, while the dot-and-dash lines show the offset of the log-carriage from the cutting plane of the saw.

In the drawings the saw is represented by S, the carriage-body by C, and axles of the carriage-wheels by A. Securely fixed to one or more of the carriage-axles is a collar 2, having a groove around its outer circumference, in which groove the ring 3 is free to turn. This ring 3 is provided with the studs 5o 3, and pivotally connected to them is the fork end of a stop-toggle connection comprising members 4 and 4, jointed at the center with the pin 5 and having each a substantial stop 4@ to check movement in one direction when the pins of the toggle are in a straight line, as drawn. The extreme end of 4C is pivotally connected by a pin '7 to a bracket 6, sel cured to the frame of the carriage. A movement of the toggle tothe position as shown by dot-and-dash lines in Fig. 2 by shortening the distance between the pins 3 and 7 compels the carriage-body, as the wheels are grooved to hold to the rail, to travel laterally in ils bearings on the axles the desired distance to effectually clear the saw, and, conversely, as the toggle is straightened against the stops 4 the carriage is returned to its normal position for advance to the cut.

I will now describe the manner of imparting to the toggle-pin 5 the desired movement. 7o Fulcrumed to the frame of the log-carriage by the pin l0 is a lever ll, and a suitable distance from its fulcrum the link or links l2 connect this lever to pin 5 of the toggle, while the free end 1l is suitably connected 75 to an endless rope or line 13, passing around grooved wheels 14 beyond the extreme limits of the travel of the log-carriage C. One of these sheaves is mounted on a tighteningframe to permit ot' the line being kept taut, and on the axle of the other iskeyed a brakepulley 16, on which a strap or brake-block 17 enables the required resistance to be imposed. Thus when the carriage is reversed for its return movement the friction ofthe brake-strap opposes sufcient resistance or pull on the lille to draw the lever ll to the position shown in dot-and-dash lines, forcing the toggle with it by means of the links l2 with the increased power due to the leverage. Similarly when 9o reversing for cut the friction of the brake on the pulley by means of the endless line gives sufficient resistance to pull the toggle to the straight position against its stops, and the body of the log-carriage is returned to the normal.

Having now particularly described my invention, what I claim as new, and desire to be protected in byLetters Patent of the United States, is-

1. In an oiset mechanism for the carriage of a saw;v toggle-levers horizontally disposed IOO adjacent to one or more of the axles of the carriage-Wheels, one end of such toggle being pivoted on a ring in which the axle is rotatable, while incapable of end movement through it, the other end of the toggle being pivotally connected to the underfranle of the carriage; and an endless rope passing around grooved wheels, one of which is connected to a brake-pulley; and means connecting said toggle with said rope whereby the toggle mechanism may be actuated from and to the straight, so as to draw the carriage laterally on its axle-bearings from the cutting plane of the saw, and restore it as desired.

2. In a saw-log carriage, the Wheels of which have alateral hold on the rails on which they run, and havinga toggle mechanism adapted to move the underframe of the carriage laterally on the axles of its wheels as desired; stops in the center joint of the toggle in the extended or straight position, so that the underframe of the carriage shall be rigidly held to the cutting plane of the saw, a lever controlling said toggle and having its free end adapted to frictionally engage an endless rope; anged wheels for carrying said rope, one of said wheels, through its shaft, being in rigid connection with a pulley having a brake-strap, whereby the movement of the rope in either direction is suiciently resisted to operate the toggle, and shift the carriage to the desired lateral position in both its forward and its return movements, as specified and for the purpose set forth.

3. In the log-carriage of a saw as described, having an offset mechanism to move the carriage-underframe laterally on its axles; an endless line passing over sheaves beyond the extreme limit of each end of the carriage travel, such line being attached to the offsetting mechanism on the carriage; means for keeping the line tight; and a designed frictional resistance to the movement of the line with the carriage, so that as the carriage moves in one direction, an opposite pull may be exerted on the line to operate the oset mechanism.

4. In a mechanism for oisetting the logcarriage of a saw by means of a toggle connected at one end to one or more of the axles of the carriage, and at the other to its underframe; a lever fulcrumed to the carriage-un derframe adjacent to the toggle, and having its opposite end attached to the operatingline; a link or links connecting the joint-pin of the toggle to the aforesaid lever, whereby the pull of the operating-line may be communicated to the toggle with an increased effort.

5. In a device for offsetting a saw-log carriage, the Wheels of which have a lateral hold on the rails; the grooved collar 2 secured to one or more of the carriage-axles; the ring 3 having studs 31l adapted to t the groove of 2, so that 2 shall be rotatable in it; the stoptoggle composed of members 4 and 4a, one extreme of which is adapted to receive the studs 3a while the other is pivotally attached to the carriage-underframe; the lever 11 fulcrumed to the underframe adjacent to the toggle; the links 12 connecting such lever to the toggle; the endlessline 13 passing around the sheaves 14, one of which is mounted in a tighteningframe, such line being attached to the free end of each lever 11; and thebrake-pulley 16 keyed to the axle of one of the sheaves 14, and having a friction-strap or brake-block whereby a resistance is offered to the movement of the line 13 with the log-carriage sufcient to operate the mechanism and offset the carriage-frame on the axles of its wheels.

6. The combination with the wheeled axles, movable in reverse directions on suitable supporting-rails, an endless cable connected to the axles for imparting reverse movement thereto, and the supporting-frame C loosely mounted on the axles, and a frictonfbrake for retarding the action of the cable at the beginning of its reverse movements; of a toggle mechanism, comprising the members 44a having a stop-hinge connection, the member 4 being connected to on'e frame member C, the other toggle member 4 having a pivotal and slidable connection with one of the wheeled axles, the lever 1l, having a fixed pivotal connection at one end, its other end being joined with the driving-cable, and a link joining said lever ll and the pivotal connection of the two toggle members 4 and 4, all being arranged substantially as shown and for the purposes described.

In testimony whereof I have hereunto signed my name to this specification in the presence of two subscribing witnesses.

SAMUEL ERB.

In presence of- GEO. R. ELLIOTT, C. C. MUIR.

IOO 

